# Model comparisons between linear models and linear mixed effects models

I'm interested to know if there is a method for comparing the performance of two different models, such as a linear model and a linear mixed effect model on the same data set? I'm interested to compare these two statistical models and comment on their suitability for interpreting the data. Any suggestions would be greatly appreciated!

• To clarify, do you mean a LRT between the two models or is there a way to test just the random effects in the mixed model. I have been using the lmer package in R with these two models: mixedmodel <- lme(Mass ~ Temperature + Time + Temperature* Time, random = ~1 + Time | Tank, data = input) linearmodel <- lm(Mass ~ Temperature + Time + Temperature* Time, data = input) lrtest(mixedmodel, linearmodel) Feb 3 '17 at 1:36